someonenotyou
Member
Last Activity: Today, 11:14 AM
Joined: 02-27-2021
Location: RIX
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Yeah, voltage injection is out of question. CPU still works, and there are no other components that could be faulty.... -
Thank you for reply.
Made the measurements:
D4058 Pin 1 > L74 Pin 1 = 0ohm
L74 Pin 1 > L74 Pin 2 = O.L
L74 Pin 2 > GND = 2ohm
Anyway, I removed the TVS, but still no changes.
All this started to happen after BIOS update (according to my colleague)
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I finally received 1.8V conversion board and flashed a different BIOS. Still no changes.
Board - Lenovo A485 NM-B711
I started to test resistance on USB 2.0 D+ and D- pins. Almost all of them had 0,6Mohm resistance, except D- line going to a USB C port, which had only 2ohm resistance.
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I desoldered the L74 component, but the 2ohm resistance still remained. And the line goes straight to CPU.
Does that mean the USB...Leave a comment:
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Hi.
Could I get, please, admin password removed from the BIOS?
Lenovo V15 G3 ABA
S/N - PF46WRGZ
I tried the BIOS user Rebirth uploaded, but I got error when saving BIOS settings - Failed to save storage: AmdSetup. Status: Write Protected.
Thank you....Leave a comment:
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Lenovo A485/T480 USB stops working when USB2.0 is plugged.
Hi.
I have 2 Lenovo laptops (A485 and T480) with identical USB problem.
When I plug in a USB 3.x device (USB storage), the USB ports are working normal.
But as soon I plug in USB 2.0 device (mouse, USB storage), all the USB ports stop working. Even if I plug in USB 3.x device.
The only way to get USB working again is disconnect battery and reset BIOS.
Has anyone had anything similar?
I have not yet tried another BIOS, but would that be the problem with USB?
Thank you. -
SY8003 instead of SY8003A
Hi.
I have a Lenovo HLS1C_HLS1D LA-L502P board with bad SY8003A DC/DC converter.
I have a different mother board witch contains SY8003 DC/DC converter.
Can I use SY8003 instead of SY8003A converter?
These are the differences -[LIST][*][B]Short Circuit Protection[/B]:[LIST][*][B]SY8003[/B]: Uses latch-off protection. This means that when a short circuit is detected, the device will shut down and remain off until it is manually reset.[*][B]SY8003A[/B]: Uses hiccup mode protection. In this mode, the device will repeatedly attempt to restart after a short... -
How to transfer information from one BIOS to another?
Hi.
I am starting to learn about UEFI BIOS.
At the moment I have Lenovo laptop with bad BIOS.
I tried to clean ME region and transfer EC region from a known working BIOS, but the laptop does not POST (just fan spin).
So there is something else bad.
If I flash a know working BIOS, the laptop POSTs and boots into Windows.
But the problem is, that the serial numbers, Windows key, and every thing else is from another laptop.
Where do I start to transfer the S/N, Windows key and other information from one BIOS to another?
Thank y... -
The SYS_PWROK still has 3.3V present, but 1.2V line is still shorted.
I opened PJM2 jumper, and short was gone from PUM1 controller, but still present going to RAM slots and CPU.
I inspected RAM slots and everything seemed fine. But I did resolder all the PINs. Still shorted....Leave a comment:
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PLT_RST to ground - 70k Ohm
Today I went through the voltages again and I noticed the board was missing 1.2V.
Then I found that there was a short on 1.2V line (0.0 Ohm).
[URL=filedata/fetch?id=3581614&d=1740563221][ATTACH=JSON]{"alt":"Click image for larger version Name:\tHP_250_G8.png Views:\t0 Size:\t519.5 KB ID:\t3581614","data-align":"none","data-attachmentid":"3581614","data-size":"thumb"}[/ATTACH][/URL]
1. Where I noticed the short.
2. I removed the PUM1 controller...Leave a comment:
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I did some more measurements on the startup sequence:
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It seems that everything stops at SIO_SLP_S4# where PCH sends enable signal for 2.5V. When I press power button, my multimeter does not register anything.
Where should I look now?I did some more measurements on the startup sequence:
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3580712}[/ATTACH]
...Leave a comment:
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I got these measurements:
1-2-3 - 19.83V
4 - 24.51V
5-6-7-8 - 19.83V...Leave a comment:
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Thank you SMDFlea for a clean BIOS.
Unfortunately, there are still no sign of life after flashing the BIOS.
I don`t know if it is related, but there is no charger light as well when I plug in the adapter, even if battery is connected.
Also, where it is supposed to be 19V, with no adapter connected, I get battery voltage (10.25V). Should it be like that?...Leave a comment:
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Hi.
Could I, please, ask for a clean BIOS for HP 250 G8?
S/N - CND1117031
Thank you....Leave a comment:
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I checked all the PINs with tweezers trying to move them....Leave a comment:
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SYS_PWROK - 3.3v
PLT_RST - 0.009V
DRAMRST - 0.010V...Leave a comment:
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Yes, I just uploaded them here - [URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/3570155-hp-250-g8-fpi50-la-h329p-schematic-and-boardview"]HP 250 G8 FPI50 LA-H329P Schematic and Boardview - Badcaps[/URL]Yes, I just uploaded them here - [URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/3570155-hp-250-g8-fpi50-la-h329p-schematic-and-boardview"]HP...Leave a comment:
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HP 250 G8 FPI50 LA-H329P Schematic and Boardview
Hi.
Here is a schematic and boardview for HP 250 G8 FPI50 LA-H329P.... -
Checked all of them, they are solid on the board. And no debris between the pins, so no short.
How can I check if the EC is not defective?...Leave a comment:
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I already tried to recover BIOS using USB flash. Tried many times, leaving for 5+ minutes (don`t want to leave longer as the CPU gets very hot). The screen stays dark and no activity on USB.
Tried with Win+B, Win+V, B, V key combos....Leave a comment:
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I did not tur it on without heatsink. I just removed it to see if there was any burnt component under the heat pipe.
I noticed the CPU got hot because the heat pipe got really hot and the fan did not turn on to cool it....Leave a comment:
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